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Full text of "Medical Jurisprudence And Toxicology"



This   condition
their  colour

cannot  be   simulated  by   artificially
is   then   cinnabar  red,   without  any

air  into  the  lungs,
inflating the  lungs,   as

(^^JS&agbt.—As regards the weight of the lungs two tests are
applied, viz. the static test obtained by taking the absolute weight of the
lungs, and the hydrostatic test which depends on their specific gravity.

Static Test or Fodere's Test.—In order to weigh the lungs they are
removed along with the windpipe and bronchi after ligaturing the

pulmonary vessels and sepa-
rating them from the heart
and thymus gland,
average weight of the
lungs varies from 450 to 6TO
grains, while, owing to the
increased flow of blood into
the lungs, their weight is
increased after respiration
from 900 to 1,000 grains.
This varies in proportion to
the weight and development
of the child and according
to the degree of respiration
that has taken place. For
obvious reasons it is not
possible to weigh the lungs
before and after respiration
in any one case. Hence this
test is worthless for medico- 1
legal purposes, and another
test has been devised in
which the ratio of the
weight of the lungs to that
of the Ixxiy is taken into
consideration to e&tabllsfct
Fig. 249.—Respired lungs of an infant who           the ,fact of live-birth. TSiis

survived after birth.                             is    knowEt,    as    Plcwcqwefs

Test as Ploocquet was tibe

first to ascertain that the proportion of the weight of the lungs to feat of
Hie body is 1 : 70 before respiration, and 1 : 35 after respiration, but this
test also has no medico-legal value as the ratio of the weights is mostly


•*        «*

Hydrostatic Test.—TQbis***is* the most reliable and valuable Jgjsi^ and
should, as a rule, be performed before an opinion is given as to^metifaer
sespration has taken place or not. J£Ms based on the fact that the specific
Cavity of the unrespired lungs var&lrom 1,040 to 1,056, and that of €be
jfespired lungs is 940 owing to their volume being increased due to the
.presence of air. J3l£ ^^ lungs, therefore, sink in water, and those, that
faave breathed, float

The Method of Test.—The method of performing the test is* to
fee lungs as far as the trachea along with the heart and thymils
securing the large vessels, and to place them in a glass jar or vessel*
twelve inches high and eight to ten inches in diameter, filled
gr preferably with distilled water, and to note whether they<1
** ^ lungs are then separated from the heart and thymus by
the bronchi, and dividing them above it, when each Imi
into the vessel to note its buoyancy.   Each inE^g